2.7×2.3+8.3×2.7-0.2×8.1=2.7×(2.3+8.3)-0.2×3×2.7=2.7×10.6-0.6×2.7=2.7×(10.6-0.6)=2.7×10=27
原式=2.7×(2.3+8.3)-0.2×3×2.7=2.7×(10.6-0.6)=2.7×10=27